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AMC1304 Do not leave the inputs of the AMC1304 unconnected (floating) when the device is powered up

Zhou Fang67
Expert 4250 points

Hi Expert,

In AMC1304 datasheet, there is an instruction: Do not leave the inputs of the AMC1304 unconnected(floating) when the device is powered up.

In motor drive phase current application, shown as below:

If the driver for HS and LS MOSFETs are power-off, both FETs are off, the same for all other FETs in other 2 phases. In this case, the inputs of AMC1304  are actually connected to both side of sensing resistor(2 inputs are virtually shorted). If AMC1304 is powered up in this case, does it cause any problem?

Thanks.

Zhou